Calculate 7580

The isosceles triangle XYZ has a base of z = 10 cm. The angle to the base is the sum of the angles at the base. Calculate the area of the triangle XYZ.

Correct answer:

S =  25 cm2

Step-by-step explanation:

z=10 cm  A+B+B=180 A=B+B  A+2B=180 A2B=0  Row2Row1Row2 A+2B=180 4B=180  B=4180=45 A=1802B=1802 45=90  A=90 B=45  S1=z2=102=100 cm2 S=4S1=4100=25 cm2

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